Question

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Exercise 2 In this exercise, students will evaluate the volcano Popocatépetl in Mexico 1. Using the information provided on pages 17 of this lab, what is the gradient along the eastern slope of the volcano? Provide your answer in m/km and f/mi. Show your work! 2. What kind of volcano is this? What is the likely magma composition? How could you tell? 3. Based upon the information presented in the lab, assess the hazards associated with the volcano Popocatépetl in Mexico. Don't forget to consider the volcano and magma types. Fill in the accompanying charts (pages 181-19) and determine any necessary evacuation plans! contour Map of Popocatépetl and Surrounding Region 4 Klometers Contour Interval 100m Google Earth Satellite Imagery Map of the Region: ı Saito 哘amac as ocuico oto apan an Andrés Tialamac Google earth EES GEO 21 1 ·Physical Geology

Answer 1

a) On the eastern slope, the height of the volcano changes by about 1500 meters over a distance of 4km. The gradient is therefore 1500/4 m/km = 375 m/km or 1980 ft/mile.

b) Based on the light grey color of the volcano in the Google Earth image and the slope in the DEM, the volcano is likely rhyolitic to andesitic in composition. i.e. acidic to intermediate.

c) Jamacas is located around 10 km from the volcano and has the greatest hazard potential in case of an eruption. Since the volcano is acidic to intermediate in composition, the greatest threat is posed by a pyroclastics that are spewed out during eruption rather than the flow itself, which would be too viscous to travel far. Evacuations would need to be conducted for a shorter radius than would be required if the flow were basic.